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Finding the Fourth Proportional to 415.37, 622.01 and 209.64

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Solution

The fourth proportional to 415.37, 622.01 and 209.64 is: 313.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.37 : 622.01 = 209.64 : x
  2. Step 2: Convert to fraction form
    415.37/622.01 = 209.64/x
  3. Step 3: Cross multiply
    415.37x = 622.01 × 209.64
  4. Step 4: Simplify right side
    415.37x = 130,397.13
  5. Step 5: Solve for x
    x = 130,397.13/415.37
  6. Step 6: Final answer
    x = 313.93

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.